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Structs cannot be declared in their own file(s)

The bug

  • Create a blank file (I used /Game/Public/Structs/MyStruct.h)

  • pragma once

    include "Object.h"

    USTRUCT() struct FMyStruct { GENERATED_USTRUCT_BODY() };

  • Compile

You will get the following error: error C2143: syntax error: missing ';' before '}'


After much debugging, I have finally found the issue using the Struct reference, in the line that states

Structs are declared prior to the class declaration.

Moving the same empty struct in front of a UCLASS declaration (empty or not) then allows the project to compile.


This is (arguably) a bug. At the very least, the error message should be more sensible/informative.

Product Version: UE 4.10
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asked Dec 15 '15 at 04:50 AM in Bug Reports

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Actual solution found:

include "MyStruct.generated.h"

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answered Dec 15 '15 at 05:29 AM

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